<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="wrapper">
        <button id="delete_btn">删除</button>
        <div id="item"></div>
        <div style="height: 50px;"></div>
        宽<input id="ln" type="number" value="4"/><br/>
        高<input id="lm" type="number" value="4"/>

        <div id="view">
            <div id="view_wrapper"></div>
        </div>
    </div>
</body>
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</html>